/Engine/Plugins/Media/PixelCapture/Source/PixelCapture/Public/PixelCaptureCapturerMultiFormat.h
Like RequestFormat except if the format does not exist it will add it and then wait for the format to have output. NOTE: This will block the calling thread so it is important that the capture process is not dependent on this calling thread or we will deadlock.
The final buffer of a given format or null in case of timeout or the capturer has been disconnected.
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IPixelCaptureOutputFrame](API\Plugins\PixelCapture\IPixelCaptureOutputFrame) > WaitForFormat ( int32 Format, int32 LayerIndex, uint32 MaxWaitTime )